Adaptation of hurricane risk perception scale to earthquake risk perception and determining the factors affecting women's earthquake risk perception     

Mızrak  Sefa  Özdemir  Ahmet  Aslan  Ramazan 《Natural Hazards》2021,109(3):2241-2259

Natural Hazards - Worldwide studies show that gender is an important variable affecting disaster risk perception and that women have high levels of disaster risk perception. The objective of this...  相似文献   

The porosity of saturated shallow sediments from seismic compressional and shear wave velocities     

Osman Uyanık 《Journal of Applied Geophysics》2011,73(1):16-24

This study devises a new analytical relationship to determine the porosity of water-saturated soils at shallow depth using seismic compressional and shear wave velocities. Seismic refraction surveys together with soil sample collection were performed in selected areas containing water-saturated clay–silt, sand and gravely soils. Classification of clay–silt, sand and gravel dense soils provided the coefficient of experimental equation between the data sets, namely, Poisson's ratio, shear modulus and porosity values. This study presents a new analytical relationship between Poisson's ratio and shear modulus values, which are obtained from seismic velocities and porosity values of water-saturated material computed from water content and grain densities, which are determined by laboratory analysis of disturbed samples. The analytical relationship between data sets indicates that when the shear modulus of water-saturated loose soil increases, porosity decreases logarithmically. If shear modulus increases in dense or solid saturated soils, porosity decreases linearly.  相似文献   

Geohazards rooted from the northern margin of the Sea of Marmara since the late Pleistocene: a review of recent results     

Görür  Naci  Çağatay  M. Namık 《Natural Hazards》2010,54(2):583-603

Natural Hazards - Owing to its special geodynamic setting on the western extension of the North Anatolian Fault (NAF) and oceanographic setting between Mediterranean and the Black Seas, the Sea of...  相似文献   

Origin of anorogenic ‘lamproite-like’ potassic lavas from the Denizli region in Western Anatolia Extensional Province, Turkey     

Kamil Yılmaz 《Mineralogy and Petrology》2010,99(3-4):219-239

The Denizli region of the Western Anatolia Extensional Province (WAEP) includes a typical example of intra-plate potassic magmatism. Lamproite-like K-rich to shoshonitic alkaline rocks erupted in the Upper Miocene-Pliocene in a tensional tectonic setting. The absence of Nb and Ta depletion, low Th/Zr and high Nb/Zr ratios and distinct isotopic values (i.e. low ⁸⁷Sr/⁸⁶Sr, 0.703523–0.703757; high ¹⁴³Nd/¹⁴⁴Nd, 0.512708–0.512784; high ²⁰⁶Pb/²⁰⁴Pb, 19.079–19.227, ²⁰⁷Pb/²⁰⁴Pb, 15.635–15.682, ²⁰⁸Pb/²⁰⁴Pb, 39.144–39.302) mark an anorogenic geochemical signature of the Denizli volcanics. All of the lavas are strongly enriched in large-ion-lithophile elements (e.g. Ba 1,100–2,200 ppm; Sr 1,900–3,100 ppm; Rb 91–295 ppm) and light rare-earth elements (e.g. La_N?=?319–464), with a geochemical affinity to ocean-island basalts and lack of a recognizable subduction signature or any evidence for crustal contamination. The restricted range of isotopic (Sr, Nd, Pb) ratios in both near-primitive (Mg# 66.7–77.2) and more evolved (Mg# 64.6–68.7) members of the Denizli volcanics signify their evolution from an isotopically equilibrated parental mantle source. Their high Dy/Yb and Rb/Sr values also suggest that garnet and phlogopite were present in the mantle source. Their strong EM-II signature, very low Nd model ages (0.44–049 Ga) and isotopic (Sr-Nd-Pb) values analogous to those of the Nyiragongo potassic basanites and kimberlites from the African stable continental settings, suggest that the parental melts that produced the Denizli volcanics are associated with very young and enriched mantle sources, which include both sublithospheric and enriched subcontinental lithospheric mantle melts. Mantle-lithosphere delamination probably played a significant role in the generation of these melts, and could be related to roll-back of the Aegean arc, lithospheric extension and asthenospheric mantle upwelling.  相似文献   

Petrographical and geochemical investigation of the Triassic marbles associated with Menderes massif metamorphics,Kavaklıdere,Muğla,SW Turkey     

Metin Bağcı  Yaşar Kibici  Ahmet Yıldız  Ömer Tezcan Akıncı 《Journal of Geochemical Exploration》2010

Vast marble deposits occur in a cover sequence of the Menderes Massif, SW Turkey. Four major marble deposits are recognized in Mu?la province based on the stratigraphic levels. These are Permo-Carboniferous aged black marbles (1), Triassic aged marbles (2), Upper Cretaceous aged marbles (3), and Paleocene aged pelagic marbles (4). This study deals with Triassic aged marbles of the southern part of the Menderes Massif. The Triassic marbles from SW Turkey consist of two big marble horizons in the Çayboyu (ÇM) and Kestanecik (KM) regions. The characteristic samples are collected from different stratigraphic levels in marble deposits in the ÇM and KM horizons. Mineralogical and major, trace, and rare earth element (REE) analyses of marble, limestone, and schist were conducted on these samples to reveal their petrographical and geochemical characteristics. The ÇM horizon is represented by calcitic marble layers. Nickel, cobalt, manganese, and iron elements filled in fractures, fissures, and intergranular spaces of calcite crystals and these elements give the pinky colour to the marble from the ÇM horizon. KM marbles were deformed, metamorphosed, and recrystallized under greenschist facies P–T conditions. As a result of the metasomatic reaction of magnesium and manganese rich fluids with marbles, dolomite, and manganese, minerals such as rhodochrosite and pyrolusite have crystallized along vein walls and layers in the KM horizon. Dolomitization was determined in KM marbles, whereas ÇM marbles show the character of limestone. MgO, MnO, Fe₂O₃, Ni, and Zn contents of marbles from the KM horizon are higher than those of ÇM marbles due to metasomatic reactions. The Sr content in white coloured marbles ranges between 11.20 ppm and 112.20 ppm and this concentration reaches up to 272.70 ppm due to metasomatic reactions and fluid intake. The REE content of Triassic marbles is independent of the abundance of carbonate and the REE enrichment observed due to syn-metamorphic fluid flow. The significant negative Eu anomaly in REE patterns indicates that the protoliths of Triassic marbles are carbonate rocks of sedimentary origin.  相似文献   

Integrated seismic hazard evaluation and disaster management approach for Turkey     

Kasım Armağan Korkmaz 《Environmental Earth Sciences》2010,61(3):467-476

A significant proportion of the urban areas in Turkey is subject to high seismic risk. An important step for seismic risk mitigation is to define the hazard and damage after an earthquake. This paper proposes an integrated seismic hazard assessment and disaster management processes for Turkey. The proposed methodology utilizes information technologies in its seismic assessment component that provides fast results for assessment. First, image process methodology by using satellite images was implemented in the seismic assessment process for fast evaluation right after an earthquake. Second, the seismic assessment process was integrated with disaster management process. As a result, through integrated seismic hazard evaluation and disaster management procedure, an effective, fast and dependable estimation of loss for Turkey was planned.  相似文献   

Investigation of groundwater contamination using electric and electromagnetic methods at an open waste-disposal site: a case study from Isparta, Turkey   总被引：4，自引：0，他引：4  

Gülçin Karlık  M. Ali Kaya 《Environmental Geology》2001,40(6):725-731

 Geophysical methods, when integrated with soil chemical and hydrogeological methods, can be used to investigate groundwater contamination. Direct current (DC) resistivity geo-electrical sounding and very-low-frequency electromagnetic (VLF-EM) data were collected at an open waste site used by the municipality of the city of Isparta, Turkey. The groundwater at shallow depths in alluvium, which is composed of gravel, sand and clay, were expected to be hazardously contaminated under and around the open waste-disposal site, in which both household and industrial wastes are known to be disposed of improperly. In this study, we mapped the spread of groundwater contamination using a VLF-EM method, which allows fast and inexpensive data collection. The method complements the results of geo-electrical sounding. There is a good correlation between the results of the VLF-EM and the DC-resistivity methods employed for the investigation of subsurface structure of the site, where soil chemical and previous hydrogeological surveys have indicated high levels of chemical concentrations. Received: 17 January 2000 · Accepted: 12 August 2000  相似文献   

The North Sea Lg-blockage puzzle     

C. Deniz Mendi  Bent O. Ruud  Eystein S. Husebye 《Geophysical Journal International》1997,130(3):669-680

  相似文献   

Holocene faulting on a tectonic margin: Georgia Basin,British Columbia,Canada     

J.?Vaughn?BarrieEmail author  Philip?R.?Hill 《Geo-Marine Letters》2004,24(2):86-96

Multibeam bathymetric data collected in the Strait of Georgia, British Columbia, have revealed two areas of seabed disturbance, interpreted to be faults. The easterly fault zone (Fraser Delta Fault) is demarked by a pockmark chain extending along strike of a southwesterly-dipping fault offset 1 km to the northeast and having a throw of over 50 m. The pockmarks occur in a region of high sedimentation, located in the Fraser River prodelta. The eastern strait fault zone (Porlier Pass Fault) occurs within a fold of the Cretaceous Nanaimo Group. Here, a series of thrust faults displace sediments from Cretaceous to Holocene by up to 40 m with over 2 km of surface expression. Based on Holocene stratigraphic displacement in an area of significant sedimentation, these fault zones are considered to be active.  相似文献   

Relation between spring-water chemistry and hydrothermal alteration in the Şaplıca volcanic rocks, Şebinkarahisar (Giresun,Turkey)     

N. Karakaya  M.Ç. Karakaya  M.T. Nalbantçılar  F. Yavuz 《Journal of Geochemical Exploration》2007

  相似文献